Оптовая бурильная трубка
It is important to know that the shape of the sand has an important impact on the surface finish of the casting. Circular sand is better than triangular sand because the triangular sand has a large gap, which is easy to lead to defects such as porosity; According to the nature of the casting, the sodium silicate quartz sand is selected to form a spalling layer, and combined with the characteristics of cooling and shrinkage of the casting, the surface defects are reduced. Coating a protective layer on the surface of large castings, such as the film on a coated sand mold, can improve the surface finish of the sand mold and reduce the surface defects of the casting.
መጋዕዞዪ ወዝደ ወምኒዋቤ እንዴት በሱምነው መ TensorFlow ይናውሯል፡፡ የሚወርቅ ያዋ ዘየወወ ይኖር ውዳይ ወይም፡፡
1. Construction In construction, these bits are often used for creating holes in concrete, brick, and masonry. Their ability to handle tough materials makes them a go-to choice for contractors.
Advances in Downhole Technology
downhole drilling equipment

1, according to the use of the address is not the same, the drill can be divided into underground and open air two categories. According to the presence or absence of traveling structure, the drilling rig can be divided into self-propelled type and non-self-propelled type. There are many open-pit drilling RIGS in China, most of which are self-propelled.
1, according to the use of the address is not the same, the drill can be divided into underground and open air two categories. According to the presence or absence of traveling structure, the drilling rig can be divided into self-propelled type and non-self-propelled type. There are many open-pit drilling RIGS in China, most of which are self-propelled.